You can obtain them from the Apps and Driver CD that was shipped with the device or download them here:
Windows XP USB: ftp://ftp.necsam.com/pub/MobilePro/900/WinXP_MP90-USB.exe
Windows 2000 USB: ftp://ftp.necsam.com/pub/MobilePro/900/Win2k_MP90-USB.exe

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A better description of the issue would help a lot, but...
If you've verified the device you are plugging into a usb port works in another computer, then here's some basic things you can try:
- Ensure plug and play service is enabled.
- Remove any usb software listed in add/remove programs or 'programs and features'.
- Ensure the usb ports are enabled in BIOS, obtain motherboard or OEM manual/support for this.
- If it's not working, but did and you upgraded your operating system, obtain your windows updates, if still not working uninstall drivers from device manager, restart your computer.

If I understand you correctly you need to obtain a usb driver for your model of phone.........here is one place you can go to obtain....be sure to read carefully also make sure you install your software before plugging up your phonehttp://www.nodevice.com/driver/MOTO_KRZR_K1/get39404.html

You can obtain the driver from the music essentials kit cd....you may be able to obtain it from other resources however.....i would suggest a google search for verizon env vx9900 usb driver....also you will want this driver in place before plugging up your phone in order to avoid any other issues that might arise.

Attempting to power on your MoblePro after "The Low Battery Warning" has been displayed and the unit switch off may result in a hard reset.
To prevent this from occurring the external power adaptor must be connected for approximately 5 minutes before turning the system on to allow the system to stabilize.